Skip to content

Instantly share code, notes, and snippets.

View aclements's full-sized avatar

Austin Clements aclements

View GitHub Profile
aclements / madv_free.go
Created October 29, 2018 15:30
Tool for experimenting with MADV_FREE
// You may want to first disable transparent huge pages:
// echo never | sudo tee /sys/kernel/mm/transparent_hugepage/enabled
package main
import (
aclements / trigger-error.go
Created July 18, 2017 20:03
Plot GC pacer trigger error function
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
aclements /
Last active July 21, 2017 00:58
Plot gcpacertrace log
# Read gcpacertrace log from stdin and plot pacing.
import sys
import subprocess
gp = subprocess.Popen(["gnuplot", "-persist", "-e", """
set xrange [0:2];
set yrange [0:1];
set xlabel "Heap ratio (h)";
set ylabel "GC CPU (u_a)";
aclements /
Created May 24, 2017 22:06
Failed attempt at using GDB unwinders for Go core files
from gdb.unwinder import Unwinder, register_unwinder
except ImportError:
Unwinder = None
if Unwinder is not None:
class FrameID(object):
def __init__(self, sp, pc):
self.sp = sp
self.pc = pc
aclements / popcnt_test.go
Created March 17, 2017 19:59
Benchmark of different ways to guard the POPCNT instruction
// Requires
package popcnt
import (
var sink interface{}
aclements /
Created January 9, 2017 19:07
$getg() function for gdb
import gdb
_Gdead = 6
class SliceValue:
"""Wrapper for slice values."""
def __init__(self, val):
self.val = val
aclements /
Last active January 17, 2017 16:55
Clone a core file with a new PC/SP for thread 1
import gdb
import re
import tempfile
import os
import subprocess
import shutil
import struct
NOTE_HDR = struct.Struct("III")
USER_REGS = struct.Struct(27*"Q")
aclements /
Created October 23, 2016 03:16
GDB Python script for Go to find a path from a GC root to an object
# Compute the object graph of a Go heap and find the path from a root
# to a target address.
import gdb
import collections
class SliceValue:
"""Wrapper for slice values."""
def __init__(self, val):
aclements /
Created October 18, 2016 20:04
Preview of proposal go/golang#17503

Proposal: Eliminate STW stack re-scanning

Author(s): Austin Clements, Rick Hudson

Last updated: 2016-10-18

Discussion at


Sorry, something went wrong. Reload?
Sorry, we cannot display this file.
Sorry, this file is invalid so it cannot be displayed.